and right on cue lately, the signs have been there. william was given a baby outfit during a recent outing and said he would keep it. >> love that. >> reporter: kate recently declined to taste a peanut butter-based sauce for fear perhaps of an allergic reaction. and lately, she's been choosing water, not wine, for royal toasts. clearly, children have been part of the plan ever since the engagement. >> i think we'll take it one step at a time, but obviously, you know, we want a family. so, you know, we'll have to start thinking about that. >> reporter: all being well, a child for william and kate will not only be a happy occasion; it will make history. for the first time, the gender of this child won't matter. the old law giving preference to male heirs is being thrown out the royal window. this child, whether boy or girl, is destined to be king or queen one day.